Whoa, never thought of that. If you look at how much blood needs to be treated in the paper it's only 3.5ml per kg. So most likely enough blood is being expos

Whoa, never thought of that. If you look at how much blood needs to be treated in the paper it's only 3.5ml per kg. So most likely enough blood is being exposed on a daily basis. However I think the major difference is going to be the intensity of the dose. Cells get through the retina and sclera pretty quickly, less then a second, and UV from sunlight isn't actually that intense on the ground (3mW/cm^2 [0]). Dosing in the paper ranges from .1W/cm^ to 200W/cm^2 for anywhere from 10 seconds to 30 minutes. In the minimum case this is ~5 orders of magnitude more UV. On a side note, I really dislike the default layout of NIH reports. I always have to pick the classic or PDF to be able to read them. [0] - https://ag.tennessee.edu/solar/Pages/What%20Is%20Solar%20Energy/Sunlight.aspx https://ag.tennessee.edu/solar/Pages/What%20Is%20Solar%20Ene...